Combined burglar alarm and window lock



Filed Dec.

s. F; HARRISQN COMBINED BURGLAR ALARM AND WINDOW LOCK 2 Sheets-Sheet 1 HVVENTUR.

SAMUEL E HARRBON ATT'Y Oct. 25, 1960 FIG. 4

FIG.6

S. F. HARRISON COMBINED BURGLAR ALARM AND WINDOW LOCK Filed Dec. 19, 1958 2 Sheets-Sheet.

INVENTOR.

SAMUEL F HARRISON ATTY.

United States Patent 2,957,445 COMBINED BURGLAL'IBIIARM AND WINDOW This invention relates to a combined burglar alarm and window lock.

:It, is a primary object of the present invention to provide adevice adapted to be mounted on a window and capable of sounding an audible alarm upon attempted unauthorized opening of the window.

It is also an object of the present invention to provide a device of the type stated wihch not only gives an audible warning upon attempted opening of the window, but also serves to lock the window against any appreciable amount of opening so as to prevent unauthorized entry therethrough.

It is a further object of the present invention to provide a device of the type stated which can be quickly and easily installed on and removed from various sizes of window sasheswithout the use of special tools. It is another object of the prevent invention to provide a device of the type stated which can be installed on a window when the latter is left partially opened, and at the same time will operate to sound an audible signal and prevent further opening of the window by unauthorized persons.

With the above and other objects in view, my invention resides in the novel features of form, construction, arrangement, and combination of parts presently described and pointed out in the claims.

In the accompanying drawings- Fig. l is a fragmentary perspective view of a window having mounted thereon a burglar alarm constructed in accordance with and embodying the present invention; Fig. 2 is a sectional view taken along line 2-2 of Fig.

, Fig. 3 is a sectional view taken along line 3-3 of Fig. 2;

Fig. 4 is a sectional view taken along line 4-4 of Fig. 3;

Fig. 5 is a sectional view taken along line 2; and

Fig. 6 is a front elevational view of the burglar alarm with the cover thereof partially broken away and showing the mechanism in the released or alarm-operating position.

Referring now in more detail and by reference characters to the drawings, which illustrate a practical embodiment of the present invention, A designates a burglar alarm comprising a housing 1 including a mounting plate 2 and a covering shell 3 which is secured to the mounting plate 2 by means of a plurality of screws 4. Integrally formed on the covering shell 3 and extending rearwardly therefrom is a U-shaped hood 5 which is secured to a mounting bracket 6 by means of a plurality of screws 7. The mounting bracket'6 is welded or otherwise rigidly secured to the outside face of the mounting plate 2 and is bent downwardly at right angles at its free end in the provision of a retaining flange 8. As will be seen by reference .to Figs. 1 and 2, the mounting bracket 6 may 5.5 of Fig.

be placed over the upper end of a lower sash 9 which 7 forms part of a window 'w with the opening 10 in the 2,957,445 Patented Oct. 25, 1960.

hood 5 presented toward the upper sash 11 of the window w. Welded to the inside face of the mounting plate 2 is a nut 12 for threadedly receiving a clamping screw 13 which projects through the mounting plate 2 and is adjustable toward and away from the flange 8, whereby the screw 13 can be drawn up tightly against the lower sash 9 and hold the burglar alarm A retentively thereon.

Welded to the upper face of the mounting bracket 6 is a rail 14 which is bent over along its longitudinal margins to form spaced parallel trackways 15 for shiftably receiving a slide bracket 16. The slide bracket 16 is, furthermore, provided with spaced parallel arms 17, 18, which are cross-connected by a bight 19, and formed on the arms 17, 18, are spaced parallel upstanding ears 20, 21, for rotatably supporting a shaft 22. Mounted on the shaft 22 adjacent the upstanding ears 20, 21, are retaining washers 23, 24, and extending through the shaft 22 adjacent the washers 23, 24, are cotter pins 25, 26. Rigidly mounted on the shaft 22 between the ears 20, 21, is a roller 27 having a hub 28 and a cylindrical rim 29, the latter being provided on one edge with a radially outwardly extending retaining flange 30.- The rim 29 and hub 28 are preferably concentric and are rigidly secured together by means of a lead disc 31 having an axially enlarged weighted portion 32 for purposes of unbalancing the roller 27. Cemented or otherwise firmly secured over the rim 29 and bearing against the retaining flange 30 is a resilient rubber sleeve 33 provided, over a major portion of its periphery, with a radially enlarged segment 34. In the central region of the segment 34, the edge of the rim 29 is formed with a concave cam edge 35, the center of which is located approximately ninety degrees from the line joining the axis of the roller 27 and the center of gravity thereof. Consequently, when the housing 1 is placed in the vertical position as shown in Fig. l, the weighted portion 32 will lie between the ears 20, 21, and the enlarged segment 34 will be presented away from the opening 10.

Welded to the inside face of the mounting plate 2 in upwardly spaced relation to the nut 12 is a nut 36 for threadedly engaging an adjusting screw 37, the forward end of which projects through the covering shell 3 and is provided on its outer end with a manipulating knob 38. On its other end, the adjusting screw 37 is provided with a diametrally reduced shank 39 which is rotatable in a. hole 40 formed in the bight 19, and mounted on the diametrally reduced shank 39 is a retaining washer 41 which is suitably held in position by means of a pin 42. Thus, by rotating the adjusting screw 37, it is possible to shift the slide bracket 16 together with the roller 27 to various positions of adjustment relative to the upper sash 11, and for purposes presently more fully appearing.

Rigidly secured to the mounting plate 2 and projecting outwardly therefrom is a plurality of posts 43, 44, 45, 46, which are also attached to an auxiliary plate 47, the latter lying in outwardly spaced parallel relation to the mounting plate 2. Journaled in the mounting plate 2 and auxiliary plate 47 is a shaft 48 which projects outwardly through the covering shell 3 and is provided on its outer end with a suitable key 49. Rigidly secured at one end to the shaft 48 adjacent the mounting plate 2 is a spiral spring 50, the other end of which is provided with a hole 51 for receiving a retaining tab 52 formed on and projecting outwardly from the post 43. Rotatably mounted on the shaft 48 adjacent the spiral spring 50 is a gear 53 and a ratchet disc 54, and rockably secured to the face of the gear 53 by means of a pin 55 is a pawl 56. Attached to the gear 53 is an arcuate spring 57 which biases the pawl 56 into contact with the teeth on the ratchet disc 54. Rotatably mounted in the mounting plate 2 and auxiliary plate 47 in spaced parallel relation to the shaft 48 is a shaft 58 provided thereon with a pinion 59 which meshes with the gear 53, and also mounted on the mounting plate 2 and auxiliary plate 47 by means of pivot members 61, 62, is a hammer 63 provided on one end with a striker 64 adapted to strike a bell 65, the latter being secured to the auxiliary plate 47 by means of a screw 66. Formed on the hammer 63 is a yoke 67 provided with arms 68, 69, which are alternately engageable with the toothed wheel 60 and thereby act to oscillate the hammer 63 upon rotation of the toothed wheel 60.

Rigidly secured to the mounting plate 2 upwardly of the striker 64- is a bushing 70 for rockably supporting a trigger bar 71 having an upper arm 72 adapted to bear against the rim 29 and cam edge 35 thereon. The trigger bar 71 is, furthermore, provided with a lower arm 73 which terminates in a laterally bent extension 74 which serves as a counterweight for maintaining the upper arm 72 against the rim 29 and cam edge 35. Soldered or otherwise rigidly attached to the lower arm 73 is a plate 75, the lower edge of which is adapted to releasably bear against a retaining member 76 which is rigidly mounted on a shaft 77 rockably journaled in the mounting plate 2 and auxiliary plate 47. The shaft 77 also projects through the covering shell 3 and is provided on its outer end with a knob 78. Formed on one end of the retaining member 76 is a downwardly projecting ear 79 adapted to bear against a flange 80 integrally formed on the striker 64 at the upper end thereof. At its other end, the retaining member 76 is wrapped around a counterweight 81, and is adapted to retractably contact a stop flange 82 secured to and extending outwardly from the post 44.

In use, the mounting bracket 6 is placed over the upper end of the lower sash 9 with the retaining flange 8 lying against the outwardly presented face of the lower sash 9. The clamping screw 13 is then rotated until it tightly engages the inside face of the sash 9 so as to clamp the device A firmly in position thereon as shown in Figs. 1 and 2. The adjusting screw 37 is then rotated to advance the roller 27 towards the upper sash 11 until the sleeve 33 is tightly pressed against the upper sash 11. Since the roller 27 is unbalanced by reason of the weighted portion 32, the radially enlarged portion 34 and cam section 35 will always be presented towards the mounting plate 2 as the adjusting screw 37 advances the roller into contact with the sash 11. Consequently, it is the radially smaller portion of the rubber sleeve 33 which is pressed against the sash 11. The knob 78 is then operated to rotate the shaft 77 and cause the car 79 to press downwardly against the flange 80, whereupon the trigger bar 71 will swing downwardly and cause the lower edge of the plate 75 to contact frictionally the retaining mem ber 76 and hold the latter in its engaged position as shown in Fig. 3. When the trigger bar 71 is in this position, the upper arm 72 will be disposed against the lower portion of the cam edge 35 as seen in Fig. 3. The key 49 may be operated to rotate the shaft '48 and energize the spring 50. Since the striker 64 is constrained against oscillation by the retaining member 76, the toothed wheel 60 will bear against the arm 68 and prevent the spring 50 from unwinding.

If a burglar or other unauthorized person attempts to raise the lower sash 9 or lower the upper sash 11, the

binds thereagainst, thereby preventing further opening of such window sash. At the same time, rotation of the roller 27 will cause the upper arm 72 to ride along the cam 35 and swing to the position shown in Fig. 6, whereupon the plate 75 will move out of contact with the retaining member 76, causing the counterweight 81 to swing downwardly and release the car 79 from retentive engagement with the flange 80. When this happens, the spring 50 will begin to de-energize and rotate the gears 53, 59, and toothed wheel 60, causing the striker 64 to oscillate and thereby intermittently sound the bell 65. Furthermore, the upper arm 72 will remain clear of the rim 29 and the plate 75 will abut the car 79 so that even if the burglar attempts to reclose the window w, the striker 64 will continue to oscillate and sound the bell 65. To reset the trigger bar 71, the roller 27 can be retracted from the sash 11 and the knob 78 rotated to move the retaining member back to the position shown in Fig. 3.

In connection with the present invention, it should be noted that the burglar alarm A can be quickly and easily installed on or removed from various sizes of window sashes as the needs arise, since removal of the burglar alarm A is readily accomplished by simply retracting the clamping screw 13. Furthermore, by retracting the roller 27 from the sash 11, the burglar alarm A can be left on the window w and will not interfere with normal operaiton thereon. Also, the burglar alarm A may be set for operation even where it is desired to leave the window w slightly opened by merely raising the lower sash 9 or lowering the upper sash 11 and thereafter rotating the adjusting screw 37 to advance the roller sleeve 33 into contact with the sash 11. Any further unauthorized opening of the window will not only sound the audible alarm, but will also allow the radially enlarged segment 34 to bind into contact with the upper sash 11 and prevent further opening of the window w.

It should be understood that changes and modifications in the form, construction, arrangement, and combination of the several parts of the combined burglar alarm and window lock may be made and substituted for those herein shown and described without departing from the nature and principle of my invention.

Having thus described my invention, what I claim and desire to secure by Letters Patent is:

1. A burglar alarm adapted to be mounted on a window and comprising a housing, audible signalling means operatively mounted in said housing, a bracket slidably mounted on said base and adapted to move toward and away from said window, a roller having a frictional surface for contacting the window and being rotatably mounted on said bracket in such manner that a portion of its periphery projects radially outwardly from said housing toward said window, adjustable means for moving said bracket toward and away from said window and holding said bracket in a selected position, a radially enlarged segment formed on the periphery of said roller, weight-forming means on said roller for normally maintaining said roller in such position that the enlarged segment is presented away from said window when the bracket is shifted toward and away from the window, a cam edge formed on said roller, and triggering means normally lying against said carn edge and being operatively connected to said signalling means so that upon rotation of said roller the triggering means will be shifted by said cam edge thereby initiating operation of said signalling means, and the enlarged segment will bind against and prevent opening of the window.

2. A burglar alarm adapted to be mounted on a window and comprising a housing, audible signalling means operatively mounted within said housing, a retaining member normally preventing operation of said signalling means, a bracket slidably mounted in said housing and adapted to slide toward and away from said window, a rotatable roller having a frictional surface for contacting said window, said roller being operatively mounted Y in said bracket in such manner as to rotate about an axis parallel to the surface of said window, adjustable means for moving said bracket toward and away from said window and holding said bracket in a selected position, a radially enlarged segment formed on the periphery of said roller, weight-forming means on said roller for normally maintaining said roller in such position that the enlarged segment is presented away from said window when the bracket is shifted toward and away from the window, a cam edge formed on said roller, and triggering means normally lying adjacent said cam edge and normally bearing against said retaining member so that upon rotation of the roller the triggering means will release the retaining member thereby initiating operation of the signalling means, and the enlarged segment will bind against and prevent further opening of the window.

3. A burglar alarm comprising a housing, an L-shaped mounting bracket on said housing and adapted to fit over a window sash, a clamping element mounted on said housing and cooperating with said bracket for rigidly holding the housing on the sash, a retaining member normally preventing operation of said signalling means operatively mounted within said housing, a bracket slidably mounted in said housing and adapted to slide toward and away from said window, a rotatable roller having a frictional surface for contacting said window, said roller being operatively mounted in said bracket in such manner as to rotate about an axis parallel to the surface of said window, adjustable means for urging said bracket toward and away from said window and holding said bracket in a selected position, a radially enlarged segment formed on the periphery of said roller, weightforming means on said roller for normally maintaining said roller in such position that the enlarged segment is presented away from said window when the bracket is shifted toward and away from the window, a cam edge formed on said roller, and triggering means normally lying adjacent said cam edge and normally bearing against said retaining member so that upon rotation of the roller the triggering means will release the retaining member thereby initiating operation of the signalling means, and the enlarged segment will bind against and prevent further opening of the window.

4. A burglar alarm adapted to be mounted on a window and comprising a housing, audible signalling means operatively mounted within said housing, a rockable retaining member normally preventing operation of the signalling means and being provided with a counterweight for holding said retaining member out of operative contact with the signalling means when the latter is operating, a bracket slidably mounted in said housing and adapted to slide toward and away from said window, a rotatable roller operatively mounted on said bracket and extending partially outwardly from said housing in a direction toward said window having a resilient frictional surface for contacting said window, means for urging said bracket toward and away from said window and for holding said bracket in a selected position whereby to place the resilient frictional surface of said roller in direct contact with said window, thereby placing said roller in such position with respect to said window that the opening of said window will cause said roller to rotate in said bracket, a cam edge formed on said roller radially inwardly of said frictional surface, and a trigger bar rockably mounted on said housing and having an arm normally lying against said cam edge, said trigger bar also having an element thereon for holding said retaining member in operative contact with the signalling means when the arm lies against said cam edge, said trigger bar being swingable upon rotation of said roller to release said retaining member and allow continuous operation of the signalling means.

5. A burglar alarm comprising a housing, means for removably clamping said housing to a window, a bracket slidably mounted within said housing, a roller rotatably mounted on said bracket and projecting outwardly from said housing, said roller being provided on its outer periphery with a slide-resistant member having a radially projecting portion, said roller also being provided internally with an eccentric counter-weight whereby to cause said roller to assume a predetermined position when said slide-resistant member is not in contact with any objects, means for urging said bracket toward and away from said window while said housing is secured to said window, said urging means also being adapted to hold said bracket in any predetermined position, and alarm means operatively connected to said roller for releasing an alarm signal after said roller has been substantially rotated to a point where the radially projecting portion of the slide-resistant member has become wedged between the roller and the window whereby to prevent further opening of the window.

6. A burglar alarm comprising a housing, means for removably clamping said housing to a window, a bracket slidably mounted within said housing, a roller rotatably mounted on said bracket and projecting outwardly from said housing, said roller being provided on its outer periphery with a slide-resistant member having a radially projecting portion, said roller also being provided internally with an eccentric counter-weight whereby to cause said roller to assume a predetermined position when said slide-resistant member is not in contact with any objects, a rod threadedly mounted in said housing and operatively connected to said bracket whereby as said rod is rotated said bracket is urged toward and away from said window and the slide-resistant surface on said roller is likewise urged toward and away from contact with said window, and alarm means operatively connected to said roller for releasing an alarm signal after said roller has been substantially rotated to a point where the radially projection portion of the slide-resistant member has become wedged between the roller and the window whereby to prevent further opening of the window.

References Cited in the file of this patent UNITED STATES PATENTS 804,241 Love Nov. 14, 1905 1,377,198 Goldstone May 10, \1921 1,959,253 Winsett May 15, '1934 2,237,019 Vinz Apr. 1, 1941 

